The ZCM series semi-direct acting automatic gas and low-pressure gas-liquid solenoid valve (nominal diameter ranging from DN10 to DN100) is a high-security, large-bore fluid control device specially designed and developed for automated pipeline control of gas safety, gas drainage, low-pressure large-flow, and atmospheric pressure vacuum pipelines. As a core execution element in inflammable and explosive gas pipe networks and various industrial low-pressure fluid control loops, this series features deep structural optimization targeting low pressure below 4bar (0.4MPa), zero-pressure conditions, and the chemical characteristics of specialized media like gas. It focuses on solving common industry pain points under ultra-low pressure environments, such as the inability of traditional pilot valves to open due to insufficient pressure differential, and the tendency of pure direct acting valves to overheat and burn out due to excessive coil power consumption under large-bore conditions. The series offers multiple premium valve body materials including brass, SS304 stainless steel, and heavy-duty cast iron (where JF/CF represents high-strength flange versions of different materials). Small-bore valves utilize G/NPT thread connections, while large-bore valves adopt international standard flange connections, perfectly matching urban gas boiler networks, gas power generation pipe networks, industrial kiln combustion control, low-pressure gas-liquid mixed transmission, and various industrial safety protection systems.

This series of valves utilizes a semi-direct acting (also known as lift-type direct acting) control mechanism and belongs to the normally closed automatic valve type. Its core advantage lies in the perfect integration of the zero-pressure differential startup characteristic of direct acting valves and the fluid dynamic assistance characteristic of pilot valves. When the electromagnetic coil is de-energized, under the rigid compression action of the return spring force, the pilot hole remains closed, and the medium enters the cavity above the main valve core (diaphragm or piston) through the fluid channel. Under the combined action of the main spring force and the gas system's own pressure, the sealing assembly is tightly pressed against the main valve seat, achieving absolutely reliable, zero-leakage airtight shut-off.

When the electromagnetic coil is energized, a customized electromagnetic assembly instantly generates a powerful electromagnetic attraction force that first opens the pilot hole, and pressure in the cavity above the main valve core quickly relieves to the outlet end through the pilot hole. Simultaneously, the moving iron core of the electromagnet directly pulls up the main valve core assembly through a specialized mechanical linkage lift structure. In extreme working conditions where the system pressure differential is 0bar (such as zero pressure differential, vacuum, or system startup without pressure), the electromagnetic force can directly and rigidly pull open the main valve port, achieving millisecond-level rigid actuation and precise switching. When a weak pressure differential exists in the system, the main valve port is fully opened through the collaborative thrust generated by the electromagnetic attraction force and the medium pressure differential, restoring ultra-large flow unhindered passage. Once the coil is de-energized, the electromagnetic field disappears, and the valve core assembly resets and locks at high speed within milliseconds under the drive of the main spring force, completing a rapid and rigid safety shut-off.

Product Image:ZCM Automatic Solenoid Valve for Gas and Low-Pressure Gas-Liquid

Feature

Semi-direct acting zero-pressure differential drive, perfectly solving actuation lag pain points under low-pressure and zero-pressure conditions: Traditional pilot valves must rely on a starting pressure differential of no less than 0.3-0.5bar under large-bore conditions. The ZCM series adopts a semi-direct acting mechanism, achieving rigid mechanical opening and closing across the full pressure range of 0 to 4bar (whether absolute vacuum, zero pressure, or low-pressure fluctuations). The actuation is crisp and neat, and the response time is shortened to the millisecond level, perfectly meeting the rigorous requirements of gas safety shut-off for rapid cutting.

Lift linkage wide-cavity flow channel design, providing excellent ultra-large flow and low fluid resistance performance: Targeting the characteristic of media such as gas and coal gas requiring massive flow accumulation through the valve in a short time under low-pressure states, the internal flow channel of the ZCM series adopts a large-channel, low fluid resistance structure. The semi-direct acting structure ensures that the valve port can be opened completely and thoroughly, and its flow capacity (Cv value) is significantly superior to that of ordinary industrial valves of the same specification, greatly reducing the pressure loss when the medium flows through the valve.

High-grade airtight composite sealing pair, providing long-lasting zero internal leakage protection for inflammable and explosive gases: In view of the extremely high permeability and danger of media such as gas and coal gas, the main seal of the valve selects specialized high-elastic, wear-resistant, and hydrocarbon medium corrosion-resistant composite hard rubber or Viton. It absolutely never deforms, hardens, or cracks under high-frequency and powerful mechanical impacts, ensuring a tight fit and long-lasting zero leakage under 4bar pressure.

Full coverage of brass/stainless steel/cast iron materials, seamlessly matching diversified industrial pipeline needs: Product specifications extend all the way from DN10 to DN100. Brass materials have extremely high cost-effectiveness, SS304 stainless steel valve bodies have excellent anti-scouring and corrosion resistance performance, and heavy-duty cast iron flange valve bodies (JF/CF series) possess a high capability to resist external pipeline mechanical stresses. Thread and flange interfaces are strictly refined according to micron-level processing standards, completely eliminating external leakage.